Find all related messages doesn't

We have a user who is on Windows 7 with Outlook 2010 (exchange sever 2003), he uses
Find all related messages a lot, but it does not work in Outlook 2010 for him.
He ends up using his XPmode Outlook 2003 to do the search which is almost instant.
In Outlook 2010 it just hangs with the orange 'action' bar scrolling constantly to indicate it is searching.

He is currently using the 32bit version as the 64bit version does not work with our templates and it also does not work for the find related messages.

The indexer is disabled by group policy, and rebuilding the index manually had no effect.

I have done a fair amount of searching for solutions but the only one I've come across is rebuild the index.

I and others do not have a problem finding related messages i.e [Conversation]: